摘要
采用金相显微镜和扫描电镜分析了热力管线中不锈钢波纹管破裂原因 .该波纹管破裂特征与一般环向开裂不同 ,裂纹沿轴向扩展 .分析认为 ,破裂属穿晶应力腐蚀 .引起应力腐蚀的介质是土壤中的氯化物 ,而应力则来自环向工作应力和冷加工残余应力 ,而环向工作应力起主导作用。
The failure analysis of the 304 stainless steel bellows used in heating pipeline has been conducted by using optical microscope and scanning electron microscope(SEM).The results showed that the cracking features of the bellows were different from the normal circumferential cracking.The cracks of the bellows propagated axially with the typical transgranullar stress corrosion cracking features.The cracking was induced by the chlorides in soil.The circumferential working stress may play a dominant role and the residual stress due to cold working were also responsible for the cracking.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2002年第6期365-367,共3页
Corrosion Science and Protection Technology
关键词
失效分析
304不锈钢
波纹管
热力管线
应力腐蚀开裂
failure analysis,304 stainless steel,bellows,heating pipeline,stress corrosion cracking
